<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>转换字符串的最少操作次数</title>
</head>
<body>
  <script>
    function fn(s) {
      let len = s.length;
      let t = 0;
      for (let i = 0; i < len; i++) {
        if (s[i] === 'X') {
          i += 2;
          t++;
        }
      }
      return t;
    }
    console.log(fn('XXX'))
  </script>
</body>
</html>